The emotion one feels in a period of hatred is an intense anger, usually, and an impulse to destroy the target of that anger.

This is a perfectly legitimate and rational emotion under certain circumstances, such as hand-to-hand combat or even intense struggle for survival in some other venue. It is possible but much more rare to feel enthusiasm while fighting for one's life, but a good solid anger is not misplaced.

When it persists after the actual moment, and goes on to inform a person's whole life, it becomes a misplaced emotion, the basis for neurotic or psychotic behavior.

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